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Enhancement of superconducting transition temperature in FeSe electric-double-layer transistor with multivalent ionic liquids

Tomoki Miyakawa, Junichi Shiogai, Sunao Shimizu, Michio Matsumoto, Yukihiro Ito, Takayuki Harada, Kohei Fujiwara, Tsutomu Nojima, Yoshimitsu Itoh, Takuzo Aida, Yoshihiro Iwasa, and Atsushi Tsukazaki
Phys. Rev. Materials 2, 031801(R) – Published 26 March 2018
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Abstract

We report on an enhancement of the superconducting transition temperature (Tc) of the FeSe-based electric-double-layer transistor (FeSe-EDLT) by applying the multivalent oligomeric ionic liquids (ILs). The IL composed of dimeric cation (divalent IL) enables a large amount of charge accumulation on the surface of the FeSe ultrathin film, resulting in inducing electron-rich conduction even in a rather thick 10 nm FeSe channel. The onset Tc in FeSe-EDLT with the divalent IL is enhanced to be approaching about 50 K at the thin limit, which is about 7 K higher than that in EDLT with conventional monovalent ILs. The enhancement of Tc is a pronounced effect of the application of the divalent IL, in addition to the large capacitance, supposing preferable interface formation of ILs driven by geometric and/or Coulombic effect. The present finding strongly indicates that multivalent ILs are powerful tools for controlling and improving physical properties of materials.

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  • Received 11 January 2018
  • Revised 20 February 2018

DOI:https://doi.org/10.1103/PhysRevMaterials.2.031801

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsInterdisciplinary Physics

Authors & Affiliations

Tomoki Miyakawa1, Junichi Shiogai1,*, Sunao Shimizu2, Michio Matsumoto3,†, Yukihiro Ito1, Takayuki Harada1, Kohei Fujiwara1, Tsutomu Nojima1, Yoshimitsu Itoh3, Takuzo Aida2,3, Yoshihiro Iwasa2,4, and Atsushi Tsukazaki1

  • 1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 2RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 3Department of Chemistry and Biotechnology, The University of Tokyo, Tokyo 113-8656, Japan
  • 4Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan

  • *Author to whom correspondence should be addressed: junichi.shiogai@imr.tohoku.ac.jp
  • Present address: Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.

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Issue

Vol. 2, Iss. 3 — March 2018

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